Which word containing the prefix anti- means "an agent that counteracts"

The pop quiz surprised natasha more than read the sentence and choose the correct pronoun.

Which word best describes the tone of "will we ever grow organs? "

What task did the surveyors do? a. they studied the landscape to determine the most direct route for building a road. b. they designed treadmills that lifted blocks of stone to where they were needed. c. they dug trenches and filled them with sand, concrete, and large blocks to form a road.